The unique BUILT TO SEND mono-shell design makes our packs almost indestructible. The main body is made from a single piece of expedition-grade composite VX42 X-Pac fabric leading to an almost seamless design. The only way of breaking a BUILT TO SEND pack is to tear though one of the toughest materials on the planet. The fabric is 100% waterproof, making our packs extremely weather resistant in rain and snow.
Our contoured shoulder straps and back panel are engineered from a proprietary foam (we developed our own 10 mm thick physically cross-linked polyethylene foam) based on a type used in fighter pilot seats. The properties of this foam give it excellent load spreading capability for shoulder straps and belt pads (X2 and X3 packs), and make the back panel forgiving of poor packing when fully loaded. Shoulder and hip pads are low-profile, for harness compatibility during rock and ice climbing.
Our hardware is custom-designed and engineered from aerospace-grade aluminium, with a hard-anodized coating for extreme durability. Our seam allowances are almost twice the industry standard, and we triple stitch structural seams using V92 bonded polyester thread, exceeding the military specification for safety-critical equipment. Load-rated webbing is bar-tacked for extreme strength. Our unique load-rated haul-system avoids “clusters” on difficult belays with bucket-style belaying (rope flaked directly into pack), allows kit management on tight bivvy ledges and is haul-rated for chimney pitches of when back-cleaning on steep ground (pack can be used as a small haul bag).
BUILT TO SEND packs represent an extreme design-optimization point, stripped down and refined to achieve the epitome of bombproof-yet-ultralight. We hand build our packs in limited numbers in Great Britain, to exacting engineering standards under an ISO 9001 quality system. Your BUILT TO SEND pack has been built without any compromise on quality. It’s the finest engineered and strongest pack on planet earth.
X1 ALPINE | WHITE
Stripped (white): 0.895 kg | 1.97 lb
With alpine pack (white): 1.030 kg | 2.27 lb
For black VX42 add 0.025 kg
X-folded: 30 L
Overload mode: 42 L
Height X-folded: 559 mm | 22.0 in.
Height in overload mode: 749 mm | 29.5 in.
Circumference bottom: 880 mm | 34.6 in.
Circumference top: 934 mm | 36.8 in.
The BUILT TO SEND X1 pack is designed for typical multi-day alpine climbing trips, longer multi-day hikes, and multi-day ascents on big-walls. Large enough for serious missions, but small enough to move quickly, this pack is the core product of our range (also offered with hip pads as the X2).